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Correlation of Ammonia Storage and Dielectric Properties of SCR Catalyst Materials by Microwave Cavity Perturbation

Title data

Dietrich, Markus ; Rauch, Dieter ; Simon, Ulrich ; Porch, Adrian ; Moos, Ralf:
Correlation of Ammonia Storage and Dielectric Properties of SCR Catalyst Materials by Microwave Cavity Perturbation.
Event: Sensor 2015, The 17th International Conference on Sensors and Measurement Technology , 19.-21.05.2015 , Nürnberg, Deutschland.
(Conference item: Conference , Speech )
DOI: https://doi.org/10.5162/sensor2015/E6.2

Official URL: Volltext

Project information

Project title:
Project's official titleProject's id
No informationMO1060/19-1

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

The ammonia-based selective catalytic reduction (SCR) has become the major NOx control strategy for light and heavy diesel engines. Before reducing NOx, storage of ammonia on the active sites of the catalyst is crucial. A better understanding of the ammonia storage behavior is needed for improvements in efficiency and control of the exhaust gas aftertreatment systems. Therefore, the aim of this article is the correlation of the dielectric properties of the SCR material with the amount of stored ammonia. Recently, a laboratory setup using the microwave cavity perturbation method had been developed especially for this purpose and has been significantly improved. This article describes the improvement process and first experimental data. Zeolite-based SCR active material in its H-form was investigated. The powder catalyst sample was monitored by the microwave cavity perturbation method under reaction conditions while storing and depleting ammonia with and without admixed NOx at different temperatures. It could be shown that both values of the complex dielectric permittivity are strongly correlated to the stored mass of ammonia. The influence of the temperature on the ammonia storage behavior was described. It could be shown by experiment that the response of the real part and the imaginary part of the complex permittivity to ammonia storage have different temperature dependencies.

Further data

Item Type: Conference item (Speech)
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Research Institutions > Research Units > ZET - Zentrum für Energietechnik
Research Institutions > Research Units > BERC - Bayreuth Engine Research Center
Faculties > Faculty of Engineering Science > Chair Functional Materials
Research Institutions
Research Institutions > Research Units
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Profile Fields
Profile Fields > Advanced Fields
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 04 Aug 2015 08:27
Last Modified: 18 Apr 2016 07:24
URI: https://eref.uni-bayreuth.de/id/eprint/16772